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maxonik [38]
2 years ago
6

Imagine the average time to complete a “4-year” bachelors degree is actually 4.3 years based on national data. You collect data

on the 20 psychology students who started school during the same semester as you, finding an average time to complete at 4.5 years, with a sample standard deviation of 0.5 years. What is your 95% confidence interval? (for your FINAL answers, round to the nearest TWO decimal places)

Mathematics
1 answer:
Nataly [62]2 years ago
8 0

Answer:

To answer you question, we need the confidence internals formula, μ±Zc*(σ/\sqrt{N}); N is the 20 psychology students, 0.5 the desviation standar and 4.3 is the medium based on national data, every fact in years.

Step-by-step explanation:

You need to consult the Zc value, you can find this table attached in this question; for 95%, we have a Zc value of 1.96.

Next step replace values: 4.3±1.96*(0.5/\sqrt{20}) = 4.3±0.22 (rounding the result)

So, the confidence interval are:

4.08cm≤X≤4.52cm

You might be interested in
Mrs. Nestler enjoys listening to classical music. She has the following audio CDs by her favorite composers in her collection: 4
ivolga24 [154]

Answer:

10.55% probability

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

The order in which the CDs are chosen is not important. So we use the combinations formula to solve this question.

1 Bach CD, from a set of 4.

1 Beethoven CD, from a set of 6.

1 Brahms CD, from a set of 3.

1 Handel CD, from a set of 2.

So, D=144

4 CDs from a set of 4+6+3+2 = 15.

So, T= 1365

p= D/T= 144/1365 = 0.1055

10.55% probability that she will choose one by each composer

4 0
3 years ago
What is 4 3/7 as a decimal.
Ymorist [56]
4.428571
I know because I googled it
4 0
2 years ago
The system of equations has no solution:<br> y=2/3x-5<br> 4x - 6y = 30<br> true or false?
Serjik [45]

1. y = 2/3x - 5

2. 4x - 6y = 30

Divide 2. by 2

3. 2x - 3y = 15

Substitute 1. into 3.

4. 2x - 3(2/3x - 5) = 15

5. 2x - 2x + 15 = 15

6. 15 = 15

False. There are an infinite number of solutions.

3 0
2 years ago
What is the mean of 86,87,95,96,88,94, and 98 please help me I need it soo much
Novosadov [1.4K]
The mean would be 92. Because you add them all up then divide by how many there are
5 0
2 years ago
3≤7+g<br><br> Help <br><br><br> I’m famous
oee [108]

<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3

Let's solve your inequality step-by-step.

3 ≤ 7 + g

Step 1:Simplify both sides of the inequality.

3 ≤ g + 7

Step 2: Flip the equation.

g + 7 ≥ 3

Step 3: Subtract 7 from both sides.

g + 7 − 7 ≥ 3 − 7

g ≥ −4

Answer:

g ≥ −4

<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3<3

8 0
2 years ago
Read 2 more answers
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